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ENGEO <br /> INCORPORATED <br /> clean water level probes. Sampling equipment that has come into contact with oil and grease <br /> will have to be cleaned with methanol to remove the oily material. <br /> All equipment decontamination episodes will be recorded in the field logbook. The general <br /> decontamination procedures are as follows: <br /> • A sufficient supply of tap water will be obtained from the MHCSD water supply system.• Copious amounts of water with a phosphate free detergent will be used to wash and brush all <br /> dirt from sampling items. <br /> • Sampling items will be rinsed thoroughly with tap water, checked for residual dirt, and <br /> rewashed if necessary. <br /> • The item will be rinsed with solvent to remove residual organics. Methanol is the <br /> recommended solvent. <br /> • The item will be rinsed twice with tap water. <br /> • The item will then be rinsed with de-ionized water(ASTM Type I1). <br /> • The item will be completely air dried prior to use. Items will be covered if not immediately <br /> used. Large items will be placed on a clean sheet of plastic. <br /> • Items not used immediately will be either wrapped in aluminum foil (small items) or in sheet <br /> plastic (larger items)to prevent cross contamination. <br /> Sample Control <br /> This section presents information on sample control including sample containers to be used, <br /> sample handling procedures, container labeling, and sample shipment. The section on sample <br /> containers includes information on sample container preservatives to be used and holding times. <br /> The section on sample shipment includes information on sample preservation in the field and <br /> during transport and chain-of-custody control. <br /> 4943.4.640.01 9 <br /> April 17, 2007 <br />